Key-seat-broaching machine.



F. I. LAPOINTE. KEY SEAT BROACHING MACHINE.

APPLICATION FILED IULYZG. 19II.

6 SHEETS-SHEET I.

' Inventor Patented Apr. 27, 1915. LY

J. LAPOINTE.

KEY SEAT BROACHING MACHINE. APPLICATION FILED iULY 26,191:

larenr'ed Apr. 27, 1915.

' GSHEETS- SHEET 2- Wibwsses d/% MM F. 1. LAPOINTE. KEY SEAT BROACHING MACHINE.

APPLICATION nuzo 1ULY26. 1911. v 1 ,137,218.- Pzfient-ed Apr. 27, 1910.

e SHEETS-SHEET a.

I Witness: Irweniqr:

M KW FrancisJLapomte, v y 1/ Xw F. J. LAPOINTE. KEY SEAT BROACHING MACHINE.

' APPLICATION FILED JULY 26 19H. I r 1 ,137,218. Patented Apr. 27, 1910.

6 SHEET$-$HEET 4.

F. J. LAPO!NTE.

KEY SEAT BROACHING MACHINE.

APPLICATION man JULY 26. 1911.-

5 1 mm rm m EH m m m/ m mJfiQ F. J. LAPOINTE.

KEY SEAT BROACHING MACHINE.

- APPLICATION FILED JULY 26, 1911. Patented Apr. 27, e SH EETSSHEET e.

1: 9 J3 .Fggil.

7 Fig.8 a? 99 i6 J6 "i J J0 i Ht 5 it I [I i if .63 J

nibzfisses: 6i Irwnbor: fiwamw Emma's 11.0 m, W7 MM wwb ww Ally.

line l:' .l" on Fig. 2.

FRANCIS J. LAPDINTE, OF HUDSON, MASSACHUSETTS.

KEY-SEAT-BROACHIN G MACHINE.

Specification of Letters Patent.

Patented Apr. 27, 1915.

Application filed July 26, 1911. Serial No. 640,960.

To all 10/1 am it may concern Be it known that I, FRANClS J. LAPOINTE, a citizen of the United States of America, and a resident of Hudson, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Key-Seat-Broaching Machines, of which the following is a specification.

This invention" relates to key seat broaching machines, and has for its object the production of a machine in which key seats may be cut in pulleys, gears, and similar articles having bores of different diameters without requiring any complicated adjustments or change in the mechanism to adapt the same for different sizes of bores in the articles to be operated upon. It provides for a suitable mechanism for operating the working tool, insuring its steady movement during its operation, thereby accomplishing better results than in machines now in general use.

The invention further consists in certain novel features-of construction and arrangement of parts which will be thoroughly understood by reference to the description of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents a plan of a machine embodying the features of the present invention. Fig. 2 represents a vertical longitudinal section of the same, the cutting plane being on line 22 on Fig. 1.. Fig. 3 represents an end elevation of the same, showing a cutting tool insection F i". 1 re iresents a transverse vertical secb A i tion of the same he cutting )lane be1n on big. 0 represents a rear elevation of a portion of the machine, showing the mechanism for operating the clutches. Fig. (3 represents an end elevation of one of the clutch mechanisms. drawn to an enlarged scale, the cutting plane being on line (3(5 on Fig. 2. Fig. 7 represents a. vertical section through the reciprocating carriage or slide head and the broach or tool holder supported therein. Fig. 8 represents a horizontal section of the same. the cutting plane being on line 88 on Fig. 7. 9 represents a transverse vertical section of the same, the cutting plane being on line 99 on Fig. 7. Fig. 10 represents a perspective view of the end of the bed frame and showing the perforated end plate thereof, and Fig. 11 represents a perspective view Fig.

of the removable face'plate the shank of which is normally positioned in the perforation in said end plate.

Similar characters designate like parts throughout the several figures of the drawings.

In the drawings, 10 represents a base provided with an extension 11, this extension or bed frame 11 being supported at its outer end by means of a standard ,12 and being open at the top. The inner face of the side walls of this bed frame 11 is provided with the guide-ways 11 extending lengthwise thereof. Secured to the base 10 and at I either end thereof, and the brackets 13, in which is revolubly mounted a shaft 14. Keyed to the shaft 14 and adjacent to the brackets 13 are clutches 15 and 16, each composed of' an outer member 17 and an inner member 18. The inner member 18 of the clutch 15 is keyed to and revolves with a sleeve 19, mounted upon the shaft 14 and revoluble independently thereof. The opposite end of this sleeve 19 has keyed thereto so as to revolve therewith a pinion 20. The inner member 18 of the clutch 1G is in a. similar manner keyed to a sleeve 21,.II1OL1I117- ed upon the shaft 14 and revoluble inde-- pcndently thereof, the opposite end of said' sleeve having keyed thereto a gear The sleeve 1!) has slidably mounted thereon a 25 is secured to a reciprocating rod 26- niounted in hearings in the brackets 13. Midway between the forked members is a lever 27 pivoted at 28 to the base 10, this lever being provided with a projection 29 extending into a slot 30 formed in a mem ber 31 secured to said reciprocating rod 2H. It is obvious that whenever the lever 27 is moved about its pivot 28, the clutch operating members 23 and 24 will be moved longitudinally of the sleeves 19 and 21 to engage or disengage the clutches 15 and 16, as the case may be. The inner member 1? of each of the clutches 15 and 16 has pivoted thereto a member 32 adapted to be engaged by thev {conical ends of the operating members 2'1. or 24 when said members are moved toward the inner member 18. As the member 32 is moved about its pivot by this means, it will move outwardly the outer end of the 'member 33 pivoted at 3-1 to the inner member 18, and having a block 35 secured to or formed upon its inner end, said block being interposed between the ends of a split ring 36. lt is obvious that when the block 35 is moved about the axis ofthe pivot 3 1 the split ring 36 will be expanded and caused to engage with the outer member 17",of the clutch. The outer member 17 of the clutch 16 is adapted to be driven by any suitable belt, thereby causing a continuous rotation of the shaft 14 in one direction, and when the split ring 36 is expanded in the clutch 16.

it will cause the sleeve 21 to be rotated in the same direction. At the same time the outer member 17 of the clutch 15 is rotated in the same direction, being keyed to the shaft 14:,

' sleeve 19.

but inasmuch as thesplit ring 36 of the clutch 15 is at this time out of contact with the outer member -17 of the clutch 15, .no motion is transmitted thereby to the Secured to or forming a part of the base 10 isa vertical transverse plate 37, to which i ssecur'ed,by suitable bolts, a casing member 38. In the plate 37 is mounted a cylindrical fiang'ed bushing 39, and in alinement therewith in the casing member 38 is a similaibushing ,10. NVithin the bushing 10 is mounted a hub 41 of a gear -i2 meshing with the pinion 20 upon the sleeve 19. Secured to the gear 42 and mounted upon the hub 4:1

is a smaller gea 13'meshing with an intermediate gear 1 1 secured to and revoluble with a shaft 45 mounted in the bearing formed in the casing member38, this intermediate gear in turn meshing with the gear 22 upon the sleeve 21. The hub 41 of the is'in operation.

When it isdesired to cut a key wayin a gear, such as 51 shown in Fig. 20f the drawings, the gear is placed upon the cylindrical support 52. the shank otwhich is mounted in a face plate 53 removiibly secured to the vertical endplate 53 of the extension 11, this plate 53 having an opening therethrough adapted to give'access to the guideways .11" extending lengthwise oflhe bed frame 11. The lever 27 is then moved in such a direction as to, cause the clutch operating member 23 to engage the pivoted member 32 and cause an engagement between of the clutch 16 to be transmitted through the clutch 15 to thesleeve 19, causing the 'rotationof the gear 12 through the medium cf the pinion 20, and'as this gear 12 is spJi-ned or otherwise secured to the nut 46, nut will be rotated in a directionto cause a movement of the screw 47 in the direction of.the arrow a on-Fig. 2 of the drawings. This movement'of the screw will cause the working tool 50 to effect a cutting in the gear or other member 51 mounted upon the support 52. During this operation the smaller gear 13 being secured to the gear will rotate in the same direction, and, through the medium of the intermediate gear 41, a movement in the opposite direction will be imparted to the gear 22 and the sleeve 21 on which it is mounted, this being possible owing to the factmhat the inner member 18 and the outer member v17 of the clutch 16 are disengaged at this time. When the lever 27 is moved in the opposite direction so that the clutch-operating member 2icauses the inner and outer members 18 and 17 of the clutch 16 to rotate in unison the sleeve 21 will be rotated in the opposite direction to that just described,"and through the medium of the gears 22, -11, and 43,;the

nut 16 will be rotated in the opposite direction, thereby moving the screw 17 in the direction opposite to the arrow a on Fig. 2, this return movement of the screw being quicker than its movement in the opposite directionwhen performing a cutting operation. \Vhile this is occurring, the gear 4.2, through the medium of the pinion 20, is 1'0- tating the sleeve 19 and the innermember 18 of the clutch 15 in a'direction opposite to the rotation of its outer member, this being possible owing to the disengagement of the split ring 36 of said clutch member. The screw 47 has secured to its opposite end a carriage 5i slidable on the guides 11 ex tending lengthwise of the bed or extension .11 substantially as shown and describedin the ,Patent No. 876.977 issued to J. N. Lapoinie, Jan. 7. 1908. This carriage. is provided with a T groove in which is mounted a tool holder 55 having flanges toiit the T-groove. The tool holder 55 may be ad-- justed vertically lengthwise oi the T-groove in the carriage 51 into any desired position by means of the adjusting screw 56, therebymoving' the tool transversely of the screw 41-7. It is obvious that the supporting member 52 and the opening therein for the cut ter 50 always remain the same, and that it is necessary for each machine to have a plurality of these supports of different sizes;

To the rear of the extension 11 are a'plu- Liam re tality of brackets 57 in which s adapted to reciprocate a rod 58, the reciprocation of which is parallel to the axis of the screw 47. Secured to one end of the rod 58 is-a cennector 59 provided with a projecting member 60 engaging a slot 61 in the upper end of the lever 27. It is obvious that when the rod 58 is reciprocated in either direction this movement Wlll be transmitted through the projection 60 tothe lever 27, and thereby 24to'be moved from a neutral position in either direction to cause an engagement of one or the other of the clutch mechanisms and-16. -The rod 58 has secured thereto a collar 62 to which is'pivoted an arm 63 secured to the oscillating rod 64 mounted in bearings in the extension 11 and having a handle 65 secured to its front end, said handle being provided-with a suitable locking device 65 to engage the plate 66 to hold the rod 58 in its normal position as shown in Fig. 2, with the clutch operating members 2324 disengaged from both clutches 15 and eat the end-plate 53 with a "stop" 67 in the path of the projecting pin 68 carried by the carriage 54 so that when the carriage reaches apointnear its extreme outward position it will engage said stop 67 and move the rod 58 to the left. of Fig. 2, thereby operating the lever 27 to move the'slidable clutch operating members 23 and 24; into a position intermediate the clutches 1.5 and 16, as indicated in Fig. 2 of the drawings.

In order to operate the maohine, the parts being in the position indicated?l in Figs. 1 and 2, the operator moves the f andle 65 to the left, therebycausing the cliitch 15 to be actuated so that motion will be imparted through the pinion 20 and gear 42 to rotate the nut 46 so as to move the tool holder in I the direction of the arrow at on Fig. 2 of the drawings. This driving mechanism is so 46 geared down that the screw will move very Slowly to permit a more effective cutting. The driving mechanism will continueiuntil the stop pin 68 on the carriage 54 comes into contact with the adjustable stop 69 on the Bored 58, when-the rod 58 will be moved to ward the driving mechanism and cause the slidable rod 26 to be moved in its bearings, thereby returning the clutch operating members 23 and 24 to their normal position as in- 66 dicated in Fig. 2. T 0 reverse the movement of the screw 47 and return the tool holder to its normal position, preparatory to another cutting, the handle is moved to the right, thereby moving the clutch operating 60 member 24 into a position to actuate the clutch 16, permitting motion to be tranr-unit ted through the sleeve 21, pinion 22, intermediate gear 44, and gear 43, to the nut 46, causing its rotation in the opposite direction, 6 and thereby moving the tool holder in a dicause the clutch operating members 23 and .is desirable to have the operating parts run 16. The rod 58 is provided at the end nearcontinued until the operator causes another operation by movement of the handle 65.

It is obvious, from an inspection of the drawings, that the pinions and gears for driving the nut 46 are all inclosed in a casing 37-38, making it possible to fill this casing with oil or other lubricant. It is selfevident that this is of considerable advantage in a machine of this class, in which it smoothly and quietly. The only belt necessary for driving. the machine is that used upon. the pulley surface of the clutch member 16, this belt (not shown) being driven from any suitable countershaft. The driving mechanism for actuating the tool holder is compact and simple and permits the reciprocation of the tool holderto be stoppedin either direction without jar or injury, while it provides a rapid movement of the tool holder when not in operation and a slow movement when the tool is performing the cutting. By this construction a machine for cutting key seats and slots in articles of various sizes and of different bores is produced which is simple in construction and very ef- 'fcctivc in operation.

' it is believed that the operation and many advantages of the invention will be thoroughly understood from the foregoing.

Having thus described my invention, I claim:

1; In ZLJHZIChlDOOl the class described, the combination of a bed l'ramc; a tool holder adapted to reciprocate lengthwise tl'iercof and consisting in part of a nonrevoluble screw; a nut on said screw; gears mounted upon the periphery of said nut and secured thereto; a revoluble shaft parallel to said screw; and mechanism on said shaft adapted to coact with said gears to impart rotary movement to said not in either direction and to be moved into inoperative position by the reciprocation of said holder.

2. In a machine oi the class described, the 12c combination of a bed frame; a tool holder adapted to reciprocate lengthwise thereof and consisting in part of a. nonrcvoluble screw; a nut on said screw; two gears secured to the periphery of said nut; a revolua :5 lDlC shaft parallel to said screw; and mechanism thereon for driving said gears alternately in opposite direction adapted to he moved into inoperative position by the reciprocation of said holder.

3. In a machine of the class described, the combination of a bed frame; a tool holder adapted to. reciprocate lengthwise thereof and consisting in part of anonrevoluble 5 screw; a nut on said screw; two gears secured to the periphery of said nut; a revoluble shaft parallel to said screw mechanism thereon for driving said gears alternately in opposite directions, and mechanism operable by the reciprocating movement of said holder for stopping the operation of said driving mechanism.

4. In a machme of the class described, the combination of a bed frame; a'reciprocating tool holder thereon consisting in part of a nonrevoluble screw; a nut on said screw; two gears secured to the periphery of said nut; a revoluble shaft parallel to said screw: two sleeves upon said shaft; a pinion on each adapted to drive oneof the nut gears; clutches fixedly secured to said shaft for controlling the operation of said sleeves; manually control-led mechanism slidable lengthwise of said sleeves for actuating 25 either of said clutches; and means controlled -by the movement.of said holder for disengaging said engaged clutch.

5. In a machine of the classdescribed," the combination of a bed frame; a reciprocating tool holder thereon consisting in part of a nonrevoluble screw; a nut on said screw;

two gears secured to said nut; a rev'oluble shaft parallel to said screw; two sleeves upon said shaft; a pinion on eachadapted to drive one of the nut gears; an intermediate gear interposed between one of said nut gears and one of said pinions; clutches fixedly secured to said shaft for controlling the operation of said sleeves; manually controlled mechanism slidable lengthwise of said sleeves for actuating either of said clutches; and means controlled by themovement of said holder for disengaging said clutch.

6.- In a machine of the class described, the combination of a bed frame; a reciprocating tool'holder thereon consisting in part of a nonrevoluble screw; a revoluble nut on said screw; gears on said nut; a shaft parallel to said screw; clutch mechanisms thereon adapted to be operated to alternately transmit rotary'movement to said nut gears in opposite directions; and means operable by the movement of-said holderfor disengaging the engaged clutch at the end of the movement of said holder in either direction.

7. In a machine of the class described, the combination of a bed frame; a reciprocating tool holder thereon consisting in part of a nonrevoluble screw; a revolublenut on said screw; gears on said nut; a shaft parallel to said screw;-twosleeves mouutcd' upon said shaft and revoluble hidcpcnd-ently mit rotary movement to one of said nut gears; clutch mechanisms each having'one member secured to said shaft and another I member secured to one of said sleeves; a clutchoperating member keyed to each sleeve and adapted to be reciprocated thereon; manually controlled mechanism for moving said clutch operating member into operative position; and means operable by the movement of said holder for returning said member to its inoperative position. v 8. In a machine of the class described, thecombination of a bed frame; a reciprocating tool holder thereon consisting in part of a nonrevoluble screw; a revoluble nut on said screw; gears on said nut; a shaft parallel to said screw; two sleeves mounted upon said shaft and revoluble independently thereof; a pinion on each adapted to trans-v mit rotary movement to one of saidnut gears; clutch mechanisms each having one member secured to said shaft and another member secured to one of said sleeves; a clutch operating member keyed to each sleeve and adapted-to be reciprocated thereon; means for moving said operating memher into operative position; and mechanism operable by"'thereciprocation of said tool holder for imparting endwise movement to said clutch operatingmembers and locking them in disengaged position.

9. In a machine of the class described the combination of a bed frame; a reciprocating tool holder thereon consisting in part of a v nonrevoluble screw; a revoluble nut on said screw; gears thereon; a shaft parallel tosaid screw; two sleeves mounted upon said shaft-and revoluble independently thereof; I a pinion on each adapted to transmit ro lary movement to one of said nut gears;

,clutch mechanisms each having one member secured to said shaft and another member secured to one of said sleeves; a clutchoperating member keyed -to each sleeve and adapted to be moved thereon into operati e v position; a reciprocating rod adapted to be moved endwise by the movement of the tool holde and forked members secured thereto and adapted to move said clutch operating members into disengaged'position at the'cnd of a predetermined movement of said tool holder. 4

10. In a machine of the class described, the combination of a bed frame; a reciproeating tool holder thereon consisting in part w of a nonrevoluble screw; a nut in which said screw is mounted having a radial flange adapted to withstand the cutting thrusts; a

casing provided with bearings for said nut;

and means inclosed within said casing for rotating said nut alternately in opposite directi'ons: 11. In a machine of the class described;

the combination of a bed frame; a reciprocating'tool holder thereon consisting in part of a nonrevoluble screw; a nut in which said .130

. lengthwise of said shaft; means for screw is mounted; gears thereon; a shaft parallel to said screw; driving mechanisms thereon including pinions adapted to impart rotary movement to said gears; and a casing inclosing said gears and pinions and provided with bearings for said nut and for said parallel shaft.

12. In a machine of the class described, the combination of a bed frame; a tool holder reciprocable thereon including a nonrevoluble screw; a nut on said screw; a shaft parallel to said screw; driving mechanisms thereon for imparting rotary movement to said nut alternately in opposite directio'ns; and means for disengaging said driving mechanisms at the end of a predetermined movement of said tool holder.

13. In a machine of the class described, the combination of a bed frame; a tool holder reciprocable thereon including a nonrevoluble screw; a nut on said screw; a shaft parallel to said screw; driving mechanisms on said shaft for imparting rotary movement to said nut; clutch mechanisms on said shaft for controlling the direction of movement of said driving mechanisms; a plurality of clutch operating members slidable moving said clutch operating members to actuate either of said driving mechanisms: and means controlled by the movement of said tool holder for moving said operating members into disengaged position.

14. In a machine of the class described, the combination of a tool holder including in part a nonrevoluble screw; a revoluble nut on said screw having secured thereto two members adapted to be driven; a shaft parallel to said screwftwo sleeves thereon each provided with a driving member adapted to drive one of said nut members; means for" imparting rotary movement to said nut from either driving member; and means for stopping said rotary movement at the end of a predetermined movement of said tool holder. v

15. In ,a machine of the class described, the combination of a tool holder including in part a nonrevoluble screw; a revoluble nut on said screw having secured thereto two members adapted to be driven; a shaft parallel to said screw; two sleeves thereon each provided with a driving member adapted to drive one of said nut members; means for imparting rotary movement to said nut from either driving member at different speeds; and means controlled by the movement of said tool holder for stopping said rotary movement.

16. In a machine of the class described, the combination of a tool holder including in part a nonrevoluble screw; a revoluble nut on said screw; two gears ofdifferent diameters secured to and revoluble with said nut; a shaft parallel to said screw; means -nism on said upon said shaft for imparting rotarv motion to either of said gears; and means for stopping said rotary motion at the end of a predetermined movement of said holder in either direction.

17. In a machine of the class described, the combination of a tool holder including in part a nonrevoluble screw; a revoluble nut on said screw; two gears of different diameters secured to and revoluble with said nut a shaft'parallel to said screw; two sleeves on said shaft; a pinion on each sleeve for transmitting motionlto one of said gears; means for revolving either of said sleeves; and means for stopping the revolution of said sleeves at the end of a predetermined movement of said holder in either direction.

18. In a'machine of the class described, the combination of a tool holder including in part a. nonrevoluble screwyarevoluble nut on said screw; two gears of difierent diameters secured to and revoluble with said nut; a shaft parallel to said screw; :1 driving pulley mounted uponand secured to said shaft; two sleeves on said shaft; a pinion on each sleeve one of which meshes with one of said nut gears; an intermediate gear meshing with the other nut gear and the pinion on the other sleeve; means for imparting rotary motion from said driving pulley to either sleeve; and means controlled by the reciprocation of said tool holder for stopping the rotary motion of said rotating sleeve.

19. In a machine of the class described, the combination of a working tool; a reciproeating tool holder consisting in part of a nonrevoluble screw; a nut thereon; gears on said nut; a revoluble shaft parallel to said screw; mechanism on said shaft coacting with said gears to impart rotary movement to said not in either direction; a reciprocating device coacting with the mechaparallel shaft for controlling the direction of movement of said mechanism; a lever for controlling the reciprocation' of said device; and means operable by the movement of the tool holder for actu-,

ating said lever at predetermined times to move said reciprocating device into inoperative position.

20. In amachine of the class described, the combination of a working tool; a reciprocating tool holder consisting in"- part of a nonrevoluble screw; a nut thereon; two gears secured to said nut; a revoluble shaft parallel to said screwymechanism thereon for driving said gears alternately in opposite directions; a reciprocating rod members secured thereto and coacting with the gear driving mechanism for controlling the direction of movement of said mechanism; a lever for controlling the reciprocation of said rod; and means operable by the movement-of the tool holder for actuating said lever at predetermined times to move said mechanism controlling members into inoperative position.

21. In 'a machine of the combination of a working tool; a reciprocating tool holder consisting in part of a non'revoluble screw; a nut thereon; two' gears secured to said nut; a revolnble shaft parallel to said screw; two sleeves upon said shaft; a pinion on each adapted to drive one of the nut gears; clutches on said shaft for controlling the operation of said sleeves; a reciprocating rod provided with arms for actuating said clutches; a lever for reciprocating said rod; and means operable by the movement of said tool holder for ad tuating said lever at predetermined times to disengage said clutches.

22. In a machine of the combination of-a working tool; a reciprocating tool holder consisting in part of a nonrevoluble screw; a nut thereon; two gears secured to said nut; a revoluble shaft parallel to said screw; two sleeves upon said shaft; a. pinion on each adapted to drive one of the nut gears; an intermediate gear interposed between one ofsaid nut gears andone of said pinions; clutches on said shaft for controllingthe operation of said sleeves; a reciprocating rod provided with arms actuating said clutches; a lever for reciprocating said rod; and means operab by the movement of said tool holder for actuating said lever at predetermined times to disengage said clutches.-

23. Ina machine of the class described, the combination or a working tool; a reciprocating tool holder consisting, in part of a nonrevoluble screw; a revoluble nut thereon; gears on said nut; a shaft parallel .to said screw; clutchmechanisms thereon adapted to be alternately operated to ,transmit rotary movement to either of said nut gears in, opposite directions; and means controlled by the movement of said tool holder for disengagingsaid clutch mechanisms at the end'of its reciprocation in either direction..; i

24. In a machine of the class described,

the combination of a working tool; a recipthe class described 'with; a gear of smaller the class described,

rocating tool holder consisting part of a nonrevoluble screw; a nut on said screw; a gear keyed to said nut said keyed gear; a revoluble shaft parallel and revoluble-therediameter secured to to said screw; mechanism on said shaft 00- r acting with said gear a to impart rotary movement to said nut in either direction, the speed in one direction being different from that in theopposite direction; manually controlled means for starting said driving mechanism; and means.\ controlled by the reciprocationof said holder for stopping said mechanism.

a 25. In a machine of the class described, the combination of a working tool; a reciprocating tool holder consisting in part of a nonrevoluble screw; a un t on said screw; a gear keyed to said nut and revoluble therewithya gear of smaller diameter secured to said keyed gear; a revoluble shaft v parallel to said screw; .two sleeves freely revoluble'upon said shaft; a pinion onfonesleeve meshing with said keyed gear; a 'pinion on the other sleeve; an intermediate gear meshing with the latter pinion and" the smaller nut gear; clutcheson said shaftfor controlling the operation (if said sleeves; manually controlled means for engaging either of said clutches; and automatic means. controlled by the movement of said tool holder for disengaging said enga ed clutch at the end of the reciprocation 0 said tool holder in either direction.

26. In a machine of the class described;

the combination of a' framework; a tool holder reciprocable lengthwise thereof and adapted to receive a broaoh; a screw fixed to said tool holder; and a nut with driving 9.0

connections having bearing in the frame engaged with said screw, said nut having a ting thrusts.

lateral flange adapted to withstand the cut- Signed by'me at Post Office Sq., Boston,

Massz this 22nd day of July, 1911.

Witnesses:

W L ER E. LoiZrBARn, NATHA N (l. LOMBARD. I

FRANCIS J. LAPOINTEr 

